Ireland didn't converge that much, but of course selective migration is a big issue for that comparison. http://emilkirkegaard.dk/en/wp-content/uploads/lynn-2015-irish-iq.pdf …pic.twitter.com/KVoznl24uA
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Just to add to this you can find the same sort of arguments being made about Italian, Spanish, and other Southern/Eastern European immigrants to the United States in the 1920s. The same arguments about the gap being genetic. All the groups rose to the American average by the 50s.pic.twitter.com/q6FfV5p6Mw
What's the source for this? Googling the quotes didn't find it, strangely.
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Intelligence and Immigration by Clifford Kirkpatrick:https://babel.hathitrust.org/cgi/pt?id=uc1.32106001217279;view=1up;seq=9 …
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Also Intelligence Tests of Certain Immigrant Groups by Kimball Young https://www.jstor.org/stable/pdf/6403.pdf …
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